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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

B位异价离子(Al,Cr)置换对Li3xLa2/3-xTiO3离子电导率的影响

贺连星1,2; 柳汉印2; 李毅1   

  1. 1.上海联能科技有限公司 上海 201103; 2. 汉城国立大学材料科学与工程学院; 汉城 151-742; 汉城151-742
  • 收稿日期:2003-06-12 修回日期:2003-06-30 出版日期:2004-07-20 网络出版日期:2004-07-20

Effects of B-site Ion(Al, Cr) Substitution on the Ionic Conductivity of Li3xLa2/3-xTiO3

HE Lian-Xing1,2; YOO Han-Ill2; LI Yi1   

  1. 1.Sinoceramics; Inc. 929 GuiLin Ave. Shanghai 201103; China; 2. School of Material Science and Engineering; Seoul National University; Seoul 151-742; Korea
  • Received:2003-06-12 Revised:2003-06-30 Published:2004-07-20 Online:2004-07-20

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摘要： 研究了B位Al,Cr异价离子置换对Li3xLa2/3-xTiO3(x=0.13)离子电导率的影响。结果表明:用适量离子半径较小的Al3+(0.535A)置换Ti4+(0.605A)可有效地提高其离子电导率,当B位铝离子的置换量为y=0.02时,组分为(Li0.39La0.54)1+y/2AlyTi1-yO3的材料其室温下的体离子电导率σb=(1.58±0.01)×10-3S·cm-1,这一结果是迄今为止钙钛矿锂离子导体材料文献报道的最好水平。然而,分析结果表明,离子电导率的提高难以用锂离子迁移“瓶颈”尺寸的变化,TiO6八面体张缩能力及A位阳离子和空位的有序性来解释,因B位异价离子置换而引发的Li+离子键强度的变化被认为是导致锂离子电导率提高的原因。

关键词: Li3xLa2/3-xTiO3, 锂离子导体, 离子电导率, 钙钛矿材料

Abstract: The effect of B-Site aliovalent ion (Al, Cr) substitution on the ionic conductivity of Li3xLa2/3-xTiO3
was investigated. The results show that partial substitution of smaller Al3+ for Ti4+ is effective to enhance the ionic conductivity of Li3xLa{2/3-xTiO3.
At 300K, the maximum bulk conductivity of (1.58±0.01)×10-3S·cm-1 observed from the composition of (Li0.39La0.54)1+y/2AlyTi1-yO3
with y=0.02(x=0.13), is the highest yet reported for known perovskite solutions at room temperature. The conductivity enhancement is due to the
substitution-induced bond strength change rather than due to bottleneck size change for Li migration, TiO6-octahedron tilting or A-site cation ordering.

Key words: Li3xLa2/3-xTiO3, lithium ion conductor, ionic conductivity, perovskite

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